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Exam 1: Cells
Cells
37
Biology
Undergraduate 1
02/16/2013

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Term
Amoeboid movement
Definition
Interaction of actin filaments with myosin causes contraction of the cell, pulling the tailing end forward.
Term
Amyloplasts
Definition
The storage structure of starch within some plant cells.
Term
Cell wall
Definition
The protective and structural outline of a cell in fungi, some bacteria, and all plants.
Term
Cellulose
Definition
The main structural component of plant cell walls.
Term
Chlorophyll a
Definition
The main photosynthetic pigment; absorbs red-orange and blue-violet light.
Term
Chloroplast
Definition
The storage unit of chlorophyll within plants; endosymbiotic theory suggest that it used to be cyanobacteria.
Term
Chromoplast
Definition
Red to yellow pigments that do not photosynthesize; give plants and flowers color.
Term
Cilia
Definition
A microtubule that is found in Bronchioles as well as Paramecium. Remember 9 + 0 axoneme for non-motile cilia, while there are 9 + 2 axonemes for motile cilia. Part of the cytoskeleton.
Term
Flagella
Definition
A microtubule found in sperm, Euglena, Volvox, and dinoflagellates. Part of the cytoskeleton.
Term
Glyoxysomes
Definition
Break down fats; also breaks down carbohydrates during germination until photosynthesis begins.
Term
Golgi apparatus
Definition
Manufacturing body; modifies compounds then transport them to the outside of the cell while adding a molecular ID tag. Create polysaccharides such as pectin.
Term
Grana
Definition
A stack of thylakoids inside of a chloroplast.
Term
Leucoplast
Definition
No pigments; include proteinoplasts and amyloplasts.
Term
Lignin
Definition
The "concrete" of the secondary cell wall; it is added after growth to prevent water transfer between the cell wall and the environment/ organism.
Term
Microbodies
Definition
Include peroxisomes and peroxisomes.
Term
Microfilaments
Definition
Thinnest cytoskeletal elements; includes actin (contractile protein), while it bears tension. It aids in cell shape, movement, streaming.
Term
Microtubules
Definition
Largest elements (25 nm). Includes tubulin (contractile protein dimer), resists compression, are used as cilia and flagella.
Term
Middle lamella
Definition
A sticky polysaccharide layer that cements two cell walls together; cells need this for structure and to create plasmodesmata between each other.
Term
Mitochondria
Definition
The site of cellular respiration, creates ATP; evidence of endosymbiosis (membranes, size, DNA).
Term
Nitrogen fixation
Definition
Process that fixes atmosphere nitrogen into ammonia; carried out by cyanobacteria, green sulfur bacteria, Rhizobium.
Term
Pectin
Definition
The primary component of the middle lamella, produced in the Golgi bodies.
Term
Peroxisomes
Definition
Break down glycolic acid produced in photorespiration, produces hydrogen peroxide which is then broken down by catalase; breaks down fats and sends to mitochondria; detoxifies alcohol and other chemicals.
Term
Phagocytosis
Definition
Cellular "eating" caused by the membrane of a cell pinching off food taken in. Cause for endosymbiosis.
Term
Plasma membrane
Definition
The lipid bilayer surrounding all cells that provides a barrier between the cytoplasm of a cell and the surroundings.
Term
Cytoplasm
Definition
The "insides" of a cell: cytosol and all organelles within it.
Term
Plasmodesmata
Definition
The plasma membrane of two cells extending through adjacent walls; transports water, solutes, proteins, RNA between cells; unites protoplasts as a functional whole.
Term
Plastid
Definition
Double membrane-bound organelles that divide by fission; contain DNA; change shape and move; occasionally reproduce; 70s ribosomes; make some proteins; 2-5 nanometers long.
Term
Primary cell wall
Definition
The first cell wall of a plant cell; made of cellulose microfibrils that contain long cylindrical fibers; matrix of proteins and polysaccharides; forms in alternating directions; stretches plastically; tensile strength; young growing cells, storage cells, photosynthetic cells, parenchyma cells.
Term
Proplastids
Definition
Undifferentiated plastids; dark grown cells; grow into plastids.
Term
Ribosome
Definition
The site of protein synthesis; can be free floating or inside of cytosol; prokaryotes have 70s type while eukaryotes have 80s type.
Term
Rough endoplasmic reticulum
Definition
The connection a nucleus has with the cytoplasm; modification of polypeptide chains; adds carbohydrates turning them into glycoproteins; synthesizes membranes such as phospholipids and proteins; embedded with ribosomes.
Term
Secondary cell wall
Definition
The outer cell wall of a plant cell; made of mostly cellulose and lignin; resists change in form; cellulose steel rods inside lignin concrete; added after growth so water entering cannot break through cell wall.
Term
Smooth endoplasmic reticulum
Definition
Lipid assembly; many in seed forming cells; carbohydrate metabolism; animals degrade toxins but profilerate due to exposure.
Term
Thylakoid
Definition
The individual sacs of chloroplasts; stacked in grana; light harvesting and ATP formation.
Term
Tonoplast
Definition
Cytoplasmic membrane surrounding central vacuole; derived from ER and Golgi; starts with many vesicles; transports solutes in and out of vacuole; controls water potential.
Term
Vacuole
Definition
The central storage of the cell. Exerts pressure on cell wall, increases cell size, synthesizes ethylene and transforms sugar, stores salts, sugars, pigments, waste products, and crystal poisons, and maintains constant concentration inside of cytosol.
Term
Vesicles
Definition
Membranous sacs that move through cytoplasm; bud off of ER and Golgi; components of lysosomes.
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